What is this node called?

I cant figure out what this node is called.

I have been looking for a day, still haven’t found it.

Isn’t it just Vector - Vector (minus)?

It outputs a float though

lol, you are right - I didn’t see that.

There is no execution pin there so I thought it might be a custom macro or something but there should be a header in the node with a small gear icon and name in it. I assume it’s has to be a built-in then. You have only a screenshot of it, correct?

Also regarding the pins color - niagara modules are not always so colors strict as rest of the node networks in UE4.

Dot Product. 1 = same direction. 0 = perpendicular. -1 = Opposite direction.